Friction draft-rigging.



J. F. OCONNOR.

EMOTION 'DRAFT RIGGING.

' APPLICATION FILED JULY 31, 1911.-

Patented Nov. 12,1912.

' "UNITED STATES Ie-Ainnr OFFICE.

vvIoIIN E. oCoNNon, or CHICAGO, ILLINOIS, .assIGNoR 'ro WILLIAM II. MINER, or

' l I CHICAGO, ILIJNOIS.4

FRICTION DRAFT-RIGGING.

Specification of Letters lPatent. .Patented NOV. 12, 1912i Application filed l'uly4 31, 1911. Serial No. 641,406.

To all whom fit 'may concern.'

Be it known that I, J CHN F. OCONNOR, a citizen of the United States, residing in Chicago, in the ,county of Cook and State of Illinois, have invented a new and useful ',-Improvement in Friction DraftRigging, of

which the following is a specification.

My invention relates to an improvement in friction draft rigging for railwaycars.

i stop nular se The object of my invention is to provide a friction draft rigging of a simple, eicient'- and strong construction, composed of few parts and capable of' being cheaply manu-- factured, and more particularly in which the friction shoes may be made of relatively cheap material such as ordinary iron castings, andA at the same time be free from danger of fracture or injury under y un! usually heavy shocks and blows.l

rMy-inventionconsists in the means employed'and herein shown and described to' ractically accomplish this object, the same eing more particularly pointed out in the claims. n v

In the accompanying' drawings which form a part of this specification, Fi re 1 is a sideelevation, partly in centra vertical, longitudinal section, of a friction draft 'rigging embodying my invention.- an view,l partly 1n horizontal-f 2 is a p section, of the same.V Fig. 3 is a vertical cross section on the line 3-3 of Fig. '1.

Fig. 4 is .a perspective view of the'group of friction ,shoes assembled together,V but without the other parts. Fig. 5 is a ers 'ective view of the connecting thim le.v

ig. 6 is a .view detached, of .one of the single wedge friction shoes. Fig. 7 a similar view, of'one of the double wedge friction shoes, and Fig. 8 is an end View' of one ofthe wed elfrictlon shoes.

In the drawing, 11 re resents the 'center or draft sills of the car ameto which the .members or castings 12 are secured; 13 'the draw-bar; 14 the draft yoke; 15, 16, the front vand rear followers;v 17 a lon 'tu-` 'dinallyv movable friction shell arrange be-v tween the followers; 18, 19 s rings longlitudinally 'arranged within the iction she 2021, two sets of oppositelyarranged an'- ental wedging friction shoes, each setpre erably comprising three segmental wedging shoes 22, all preferably identical inl shapeand made from the same pattern. Intermediate between the twose'ts of friction shoes 20, 21, is a third set of friction shoes 34, .each-,consisting of an annular, se mental friction shoe 35, all preferably made identical in shape' or made from the same pattern, and each having the double wedgparallel clearance sides 38. The frontand rear sets' of shoes are each provided with annlar, internal segmental ribs 23 to aiford bearing/.for the small, short, segmental spring 24, which is interposed between the front set of shoes 20 and the rear set of shoes 21. front set of shoes also afford bearing for the flange 25 of the connecting thimble 2 6. The segmental internal ribs 23 ofthe rear Aset of 'shoes 21 afford a seat or bearing. for

the' frontend ofthe small spring 19 to reing or, four inclined faces 36, 36, 37, 37 and.

The segmental ribs 23 on the:

act against, -said small spring 19 being nested 'within the' large spring 18, which re-actsat its front-endl against the rear set 21 of said .segmental wedging friction shoes.

against the friction shoes tirelnrgersprin against the rearset' of' friction shoes, an the smaller springtlso against the rear set of friction shoes.-

I Each of the annular segmental friction shoes 22 has two mcllned or wedglngfaces '31, 32, and aclearance space 33 is left bei tween the friction shoes of each set at the larger or base ends of said shoes, to enable the shoes of each set to properly expand or spread apart under the wedging action pres# ently7 4to be explained. These three sets of annular, segmental wedging. friction shoes 21, 22 and 34 are assembled together as indicated in Fig. 4, so that the we ging faces of the rear setjof shoes bears upon' the rear wedging `faces of the intermediate set and the front wedging faces of said intermediate set bear 'against thewedging facesof the front set of shoes. y The front follower bears against the front ends vof the front set of friction shoes and the rear follower 16 against the rear.

end of the friction shell. As the annular segmental friction shoes of the front setv in` terfit or internest circumferentia'lly with the annular segmental friction shoes of the intermediate stt, and as the wedge faces of the intermediate setact against the wedge. faces of the rear set, the shoes are each and all subjectedvonly to crushing strains. They are consequently adapted to be made of relatively cheaper and more fragile material, such as ordinary white iron castings, without liability of fracture, and which, being cient and durable friction faces tothe shoes for' fio-action with the internal cylindric fricvery hard, at the'same time give very etlitionface of the malleable iron friction shell 17. The shock absorbing action of the triple set of expansible annular wedging shoes is much more eiicient than where only two sets of shoes are employed. Thus, the action of the rear set of shoes upon the intermediate shoes is multipliedby the latter in their action upon the front set of shoes, the friction thus being both graduated and multiplied by this compact arrangement of a triple set of interwedging faces.

The connecting thimble 26 and connecting ro-d Q8 serve tov hold all the parts in assembled position, and also to provide means for maintaining the springs under an initial compression and for automatically taking up any1 wear of the friction'shell and shoes. Each of the wedge faces of each of the friction shoes of all three sets is `preferably a spirally twisted wedge face instead of a straight or true plane. That is to say, each face is radial of thefriction hell at all points of the length ofthe wed face. This gives true and perfect contact between the wedge faces of adjacent shoes 'of all three sets throughout the length of ther wedge faces. This will be readily understood from Figs. 3, il, G and 7. I claim y1. In a friction draft rigging, the combination with a draw-bar, draft yoke, stop members andv followers, of a longitudinally movable friction shell, spriirs within the shell, one nested within theot ier, front and roar andintermediate'sets ofi -annulatrfseg-A mental, wedging friction sheen the shoes of the front and rear sets being furnished with internal shoulders, a supplemental spring interposed between the internal shoulders of the front and rear sets of shoes,la connecting thimble bearing against the shoulders of the arranged annular, segmental wedging, friction shoes arranged in' linewith each other longitudinally of the shell,'and :an intermental friet-ion shoes, said spring reacting at one end against the friction shell and at the other-end against one set of said friction -outer face in engagement with the inner specified. l

4. In a friction draft rigging, the combination Awith a longitudinally movable friction shell, of a spring, two. sets of oppositely arranged wedge friction shoes, an intermediate set of friction shoes,` cooperating with each of the first `named sets ofshoes, all of said sets of friction shoes'being longitudi- -nally movable in the-shell, each of the friction shoes having its outer face in engagement with the inner face ofthe friction shell, substantially as described.

5. In a friction draft rigging, the comtion shell, of a spring, two setsof oppositely arranged annular, segmental wedging friction shoes, an intermediate set of double wedgingfriction shoes, said spring reacting atone end against the friction shell and at shoes, and a supplemental spring reacting shoes and at the other end against the rear ietdof friction shoes, substantiallyas speci- 6. In a' friction draft rigging, the combination'with a longitudinally movable fric-l -tion shell, of a spring, two sets of oppositely arranged wedge friction shoes, an intermedieach of the first named sets of shoes, all of said sets of friction shoes being longitudinallytmovable inthe shell, and a S .ring located within said sets of opposite yarranlged friction shoes and coperating therewit 7. In a friction ldraftl'rigging, the comthe other end against one set of frictionate set of friction shoes coperating with- 2.. In a friction draft rigging, the' comtion-shell, of a spring, two sets of oppositely mediate double wedging set of annular, segshoes, each of the friction shoes having its A 'face of the friction shell, substantially as bination with a longitudinally movable fricat one end against the front set of friction- Lemme a binition with a longitudinally Irivable ricinitial cemiiressin, lsubstantially as specition shell, of a spring, two sets of oppositely fied. i

arranged annular segmental Wedging frici JOHN F (YCNNOR tion shoes, a' third sei*J of intermediate annul lar, double wedging friction shoes, and a `Wtnessesz` connecting thimble and rod for holding said PEARL ABRAMS, parts assembled, and 'the spring under an v EDW. S. EvARTs.

Genies ef this patent may vhe ebtained for ve centri each, by addressing the Commissioner of latents,

` 'Washhgom ID. C. 

